XLS《电缆载流量计算》

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"XLPE电缆连续载流量主要计算参数数据表",,

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"项目","单位","数据","数据", ,,

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"电缆截面","mm2","400","1200", ,,

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"电缆排列方式",,

,"水平排列", ,,

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"轴间距","mm","90","225", ,,

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"敷设场所",,

"1","土壤中", ,,

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"土壤热阻系数","k・m/w","0.

047","1.2", ,,

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"导体电阻(DC20℃时)","Ω/km","0.0617","0.0151", ,,

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"导体交流电阻(AC90℃时)","Ω/km","0.192","0.0201168854890436", ,,

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"导体与金属屏蔽之间的电容","μF",,

"0.245240827422693", ,,

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"介质损耗","W/m","0.221","0.315575001821763", ,,

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"金属护套的损耗"0","0.223649837995772", ,,

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"铠装损耗"0.621","0", ,,

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"导体与金属屏蔽之间的热阻","k・m/w","0","0.416023526430296", ,,

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"金属屏蔽与铠装之间的热阻","k・m/w","0.157","0", ,,

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"非金属护套热阻","k・m/w","0.360000305175781","0.0904721309461427", ,,

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"电缆与管道之间的热阻","k・m/w","0.048","0.286921880000441", ,,

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"管道本身的热阻","k・m/w","1.723","0.0327766475142702", ,,

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"管道外部热阻","k・m/w","2.13000122070313",,

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"穿管时周围媒质总的热阻","k・m/w","1",,

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"不穿管时周围媒质的热阻","k・m/w",,

"0.848615048442277", ,,

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"电缆芯数"90","1", ,,

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"最高使用温度","℃","35","90", ,,

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"环境温度","℃","55","30", ,,

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"高于环境温度的导体温度","℃","525","60", "电缆有限公司技术部",,

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"连续载流量",,

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"单回路","A",,

"1376.27412237852", "09-06-16",,

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"双回路不穿管","A",,

"1336.45818440199", ,,

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"1.载流量计算" "使用条件及必要系数: "序号","项目","单位","数据",,

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, "1","电压U0/U","kV",,

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"2","频率f","Hz","50",,

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, "3","介电常数ε",,

"2.30000122070313",,

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, "4","介电损耗角正切tgδ",,

"0.001",,

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, "5","铝护套导电率ρsh","Ω・m","2.84*10-8",,

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, "6","铜导体电阻温度系数","1/℃","3.93*10-3",,

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, "7","金属护套电阻温度系数","1/℃","4.03*10-3",,

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, "8","XLPE绝缘热阻系数","k・m/w","3.5",,

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, "9",,

"k・m/w","3.5",,

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, "10","运行时导体温度","℃","90",,

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, "11","运行时金属护套温度","℃","60",,

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, "12","空气温度(假定)","℃","40",,

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, "13","土壤温度","℃","30",,

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, "14","金属护套接地方式",,

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, "15","电缆间距","mm",,

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"16","土壤热阻系数","k・m/w","1.2",,

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, "17","敷设深度","mm","300",,

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"具体计算公式如下: ,,

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"其中: "I:载流量(A) "θ:导体温度与环境温度之差( "R:90℃时导体交流电阻(Ω/m) "n:电缆中载流导体数量" "Wd:绝缘介质损耗" "λ1:护套和屏蔽损耗因数" "λ2:金属铠装损耗因数" "T1:导体与金属护套间绝缘层热阻(k・m/w) "T2:金属护套与铠装层之间内衬层热阻(k・m/w) "T3:电缆外护层热阻(k・m/w) "T4:电缆表面与周围媒介之间热阻(k・m/w) "1.导体交流电阻R的计算" "R=R'(1+ys+yp) "R'=R0[1+α20(θ-20) "其中: "R':最高运行温度下导体直流电阻(Ω/m) "ys:集肤效应因数" "yp:邻近效应因数" "R0:20℃时导体直流电阻(Ω/m) "θ:最高运行温度90℃ "α20:20℃时铜导体的温度系数" ,,